Fan



J. H. COHEN FAN Original Filed July .26, 1937 I March 5, 1940.

INVENTOR Jose H Coke ATTOR t ntenteel 5,,

esteem res sleeps n. odes, Bridgeport, comjw w fiasco Products Corporation, o corotlon of? @onncctlcnt Bridgeport, Conn,

@rlptnnll nppltoution Study 26, 1937, dowel No;

misstated and tints application tune to,

193d, defied No. 212.362

e (close-zoo) Title invention relates to ions, and, ore por- I ticulorly, to ions for clrculuting ill Thls oppliestlon is s division or sppllcotion, Serlnl ltlll.

molzing ions for circulating sentlsl thot the rotstlng elements ly bolonced so that there will not my copendlng No. 155,373,, filed July 26,

olr, it is esbe dynenlicslbe any whipping notion due to the uneven weight distributime when rotstednt blob bslonee may be cuused by speeds.

severol Dynamic unfectors. One

rector mey be the mounting; or the blades on the bub improperly end i other teeter may be the menus for etrlcslly with respect to the axis or rotntlon oi the hub.

loub upon the drive short of the motor.

The second i'sctcr mentioned ebove for cousins dynamic unbolce oi the rotors elements resides in the manner-tn which the hub issecured to the shaft of the motor. pie. to set screw used, it is dim lit, for: enemcult to get to for odjustt slnce s, bole must beprovided in the hub through which on instrument can be inserted to to the screw. Both the end hole in the hub will alter the screw weight oi the hub so that some provision must be made to counterbalance the some.

dccordins to the present inventl ins means is positioned in the extend lotudinolly oi the limb oi rotation. In this member.

snclne is removed.

Another feature of the present sides in the mounting reudllyuccessible from on, the scour liub so as to,

slope its axis unbelunoe oi the hub is molded end the necessity of counterbolinvention reof the adjusting me for the clamping element so that it may be the outside without havins to provide o. sepcrote aperture for the insertlon of the tool. the bolt whlch moves the clamping In the present invention,

elements into gripping relation is mounted in the nose of the hub end extends along the axis of rotation of the hub. By n elements are mov this bolt;

the clping into srlpp position to securely hold the hub to the drive shaft of the motor.

Other features and advantages will be "apporent from the specification tion wlth the rim. to which: Figure 1 is a front elevation. P Fig. 2 1s a side elevation. Fig. 3 is a. rear view showing blades.

Fig. 4 is a. detalled section of mes.

taken in connecthe hub and the clamping mounting the According to the present waste invention. e. tan. ino= tor it has secured to its bottom surface e plate 2i having a. socket therein The plate ill may be secured to the motor housing in any desired manner, preferably by welding. Mounted to a. clamping member pivot on the plate is adapted to extend into cooperative relation with the socket in the plate to member 23 which is herein ball fitting in the socket receive a, supporting shown ashsvlns 8,

whereby the motor may be universally addusted. A screw 224; is threaded into the plate and extends through the clamping member justed position.

the forward end Flg. 2,

A hollow cup-shaped hub so ls. mounted st of the motor, and, as shown in is shaped to slightly overlap the forward to lock the motor in ed= edge of the motor housing and tapers into e. nose at the front of the fan. Dlmculty Foss been experienced in mounting such hollow hubs on the drive shaft of the motor so as not to destroy the dynamic balance ment. Accordingly, inwardly-extending of the hub and concentric totlon of the hub. This lntesrolly with the hub made and secured thereto camming surface 33 formed to slide 'ln the receive a. motor shaft 3|.

36 thereon, the cumming surface 33 W1 of the rotating etc-- the hub is provided with on sleeve 32, extending axially with the axis of ro= sleeve may be formed or may be separately The sleeve has :2. inlts bore. Mounted sufilcient size to shaft, is split so cumming surfaces adapted to engage and cooperate with thin the sleeve when moved relatively thereto. The other end of the clamping sleeve is threads bl provided with a. wall having therein which we adapted to cooperate with a. bolt 88 mounted in a recess 39 at the nos of the hub so as face of the axis of the the hub, and, upon clamping sleeve relative to the sleeve 32 whereby the cumming surface will move 'the to lie below the surhub. The belt extends along the belnr, rotated, slides clamping elements into clamping relation with the end of to the axis of rotation of t the motor shaft. Since all the elements are symmetrically positioned with respect he hub, the hub will alwaysbe dynamically balanced.

A further feature of the the accessibility of the bolt invention resides in 38 whereby the hub may be clamped to the motor shaft. In prior practice, it has been custo xnury to provide the 7 5'6 invention, the edge The hollow hub had to be provided with an apertore through which a tool could be extended to engage and adjust the set screw. Aside from destroying the balance of the hub, the set screw was very difiicult'to reach when it was desired to attach or remove the hub from the shaft. According to the present invention, however, the head of the bolt is open to view and easy access since it is positioned adjacent the outer surface of the hub and may be readily operated to lock the hub to the shaft or remove the from.

As shown with three symmetrically arranged slots 40. These slots are uniform in width and extend from the base of the hub forwardly toward the nose thereof in a substantially helical path. Adjacent their forward ends, the slots 40 are provided with a pair of recesses 4| on their side edges. These slots are adapted to receive the fan blades of the fan.

In the preferred form of the invention, a blade 42 is made of flexible rubber and is adapted to be inserted from the inside of the hub. Adjacent its forward end or that end nearest the. nose of the hub, the blade has a pro ection 43 extending from each face of the blade to engage the recesses ll in the slot to hold the blade from sliding in the slot due to the pressure of the air on the blade when in operation. This effectively prevents shifting of the blade and thereby the weight distribution of the blade about the axis of the hub and maintains the rotating element in dynamic balance.

The blade may be secured in the slots in any convenient manner. In the preferred form of the provided with a plurality of separate projecting elements or' lugs 44. In forming the edge with such projecting lugs,- a much greater flexibility is imparted to the blades than if the series of lugs were made into a solid rib. A solid rib may be used, however, when such flexibility is not required. At each end of the engaging edge of the blade, a projection or wing 45 is formed in the plane of the blade and extends to engage the inner surface of the wall to further prevent the blade from being thrown outwardly through the slot by centrifugal force when the blade is set in motion. 1

Variations and modifications may be made within the scope of this invention and portions of the improvements may be used without others.

I claim: I

1. In a fan, a hub having a sleeve extending inwardly thereof along the axis of the hub; blades mounted on the hub; a drive shaft having the end thereof disposed within the sleeve; means within the sleeve and coaxial with the shaft for gripping the sidesof the drive shaft with a radial same there in Figs. 1 and 2, the hub is provided.

positioned within the hub is pressure; and means for operating said firstnamed means to hold the hub thereon and against relative rotation with respect thereto when the fan is under load.

2. In an electric fan. a hub; blades mounted on the hub; a motor having a drive shaft; means for clamping the hub to the drive shaft comprising camming surfaces and cooperating clamping elements extending axially of the hub and positioned to engage the sides of the drive shaft for a substantial area thereof; and means extending axially of the hub for moving the clamping elements relative to the camming means and laterally with respect to the shaft into clamping relation; with the drive shaft to lock the hub thereto.

3. In an electric fan, a hub; blades mounted on the hub; a motor having a drive shaft; means for clamping the hub to the drive shaft comprising a sleeve on the hub mounted to extend axially thereof and provided with a camming surface in its bore; clamping elements mounted to slide in the sleeve and having parts adapted to engage the camming surface; and means for sliding the clamping elements to move them relative to the camming surface of the sleeve to cause them to move laterally to clamp the drive shaft and hold the hub thereon against relative movement.

4. In an electric fan, a hub; blades mounted onthe hub; a motor having a drive shaft; means for clamping the hub to the drive shaft comprising a sleeve on the hub mounted to extend axially thereof and provided with a camming surface in the bore; and a clamping sleeve slidable in the bore and having one end slit so as to form clamping elements adapted to cooperate with the camming surface in-the bore, and the other end threaded to engage a bolt mounted in the hub to extend axially of the same whereby when the bolt is turned the clamping sleeve will slide and move the clamping elements laterally into the gripping relation with the drive shaft.

5. In a fan, a hub; blades mounted on the hub; a drive shaft; means for clamping the hub to the drive shaft comprising the sleeve formed on the hub to extend axially thereof; a clamping sleeve slidable in the sleeve and having resilient clamping elements thereon provided with camming surfaces cooperable with the inwardly projecting sleeve, the clamping sleeve having a bore to receive the drive shaft; and means mounted in the nose of the hub in axial alignment with the hub for moving the clamping sleeve in the inwardly projecting surfaces to move the clamping elements laterally into gripping relation with the sides of the drive shaft, said means for moving the clamping sleeve being readily accessible for operating the clamping sleeve after the hub has been mounted on the drive shaft.

' JOSEPH H. COHEN.

sleeve to cause the camming l full till 

